There is no information on the subject. We don't know what halos do or what they're for. All we know is when they were mentioned and the two instances in which they were seen (although I still don't see the supposed "shadow residue" from Gabriel's). This article therefore has no useful information on the subject and should be deleted.
In Supernatural, the definition of halo is sketchy/finicky, but it's vaguely incorporated into their true form, and is webbed in grace. And close inspection the ashy residue contaminated the sheets above his head. --Monkeydemon, 4:39 AM, January 12th, 2020
That's just a normal burn from Kali's fire. It's there before Gabriel is even stabbed.
It's been over a week now. If nobody has any objections, I'm deleting the article (again).
Actually, Kali's burst of fire scorched the tablecloth, it was nowhere near the bedding. If you think the subject is more noteworthy as a bulletpoint on the Angels' page, then you should also delete Ruby's blonde haired vessel, for example. -- Mathematician01, 6:06 PM, January 20th, 2020 Orion's only contribution to this sub is mindlessly antagonizing and reversing non-administrator editors. SonOfEve (talk) 00:24, January 21, 2020 (UTC)